Question: What is the official language of Hildegard of Bingen?
Paraphrase: What is the official dialect of Hildegard of Bingen?
SPARQL (Wikidata):  select distinct ?obj where { wd:Q70991 wdt:P1412 ?obj . ?obj wdt:P31 wd:Q34770 } 
Answer: Lingua Ignota, Latin